scholarly journals Interaction of resorcinol-formaldehyde carbon aerogels with water: A comprehensive NMR study

Carbon ◽  
2021 ◽  
Author(s):  
Mónika Kéri ◽  
Dávid Nyul ◽  
Krisztina László ◽  
Levente Novák ◽  
István Bányai
Keyword(s):  
Carbon Aerogels ◽  
Resorcinol Formaldehyde ◽  
Nmr Study

Fabrication of Carbon Aerogels

2006 ◽  
Vol 11-12 ◽  
pp. 19-22 ◽  
Author(s):  
Y.N. Feng ◽  
Lei Miao ◽  
Yong Ge Cao ◽  
T. Nishi ◽  
Sakae Tanemura ◽  
...  
Keyword(s):  
Pore Size ◽  
Sol Gel ◽  
Supercritical Drying ◽  
Limited Range ◽  
Molar Ratio ◽  
Carbon Aerogels ◽  
Resorcinol Formaldehyde ◽  
Catalyst Content ◽  
Fabrication Parameters ◽  
Pyrolysis Processes

RF (Resorcinol-Formaldehyde) aerogels and carbon aerogels were prepared through the sol-gel method following the routes of polymerization, gelation, supercritical drying and pyrolysis processes. The influence of fabrication parameters on the textural structure of the samples, e.g., specific surface area, pore size, and pore size distribution, etc., were systematically investigated. With a decrease in the R/F molar ratio, or an increase in the catalyst content within a limited range, the porosity of the nanostructure materials increases. The optimal temperature of pyrolysis for RF aerogel was investigated by TGA (Thermogravimetric Analysis).

The Effect of Carbonization Temperature on Carbon Aerogels Structure

2020 ◽  
Vol 842 ◽  
pp. 182-185
Author(s):  
Sha Sha Wang ◽  
Yue Long Xu ◽  
Li Hui Zhang ◽  
Zhen Fa Liu
Keyword(s):  
Pore Size ◽  
Network Structure ◽  
Sol Gel ◽  
Carbonization Temperature ◽  
Carbon Aerogels ◽  
Sem Images ◽  
Resorcinol Formaldehyde ◽  
Graphitization Degree ◽  
Adsorption Amount ◽  
Xrd Patterns

Phloroglucinol–resorcinol–formaldehyde (PRF) carbon aerogels were synthesized by sol–gel reaction. The results of condition of shrinkage showed a degree of crosslinking more obvious with the increasing of the carbonization temperature. CA900 displays the highest adsorption amount and the biggest loops, as well as an increase in pore size and volume in comparison to the others samples. The SEM images of carbon aerogels under different carbonization temperature possess closer network structure and excellent connectivity, the holes between the network are abundant. The XRD patterns show that the high carbonization temperature can enhance the graphitization degree of carbon aerogels.

Hierarchically Nanostructured Zeolites of Tunable Porosities with Aerogel Templating

2011 ◽  
Vol 1306 ◽  
Author(s):  
Yousheng Tao ◽  
Morinobu Endo ◽  
Katsumi Kaneko
Keyword(s):  
Carbon Dioxide ◽  
Template Synthesis ◽  
Colloidal Silica ◽  
Lower Cost ◽  
Supercritical Drying ◽  
Nanoporous Carbon ◽  
Carbon Aerogels ◽  
Resorcinol Formaldehyde ◽  
Carbon Xerogels ◽  
Recent Developments

ABSTRACTWe present the synthesis of resorcinol-formaldehyde aerogels and carbon aerogels of different nanoporosities, emphasizing on the recent developments in fabrication pathways of lower cost. Recent results showed a simple way to the production of highly nanoporous carbon xerogels. While using an approach combined colloidal silica nanocasting and carbon dioxide supercritical drying, hydrophilicity-controlled carbon aerogels with high mesoporosity were synthesized. Then, we demonstrate the functions of these aerogels for template synthesis of hierarchically nanostructured zeolites having micropores and mesopores.

Preparation and Characterization of Phloroglucinol-Resorcinol-Formaldehyde Carbon Aerogels

2013 ◽  
Vol 423-426 ◽  
pp. 523-527
Author(s):  
Xuan Liu ◽  
Zhen Fa Liu ◽  
Hao Lin Fu ◽  
Rui He ◽  
Li Hui Zhang
Keyword(s):  
Specific Surface ◽  
Surface Area ◽  
Specific Surface Area ◽  
Sol Gel ◽  
High Specific Surface Area ◽  
Carbon Aerogels ◽  
Resorcinol Formaldehyde ◽  
Sol Gel Process ◽  
Solvent Replacement ◽  
Organic Aerogels

Phloroglucinol-resorcinol-formaldehyde organic aerogels (PRF) were prepared using phloroglucinol, resorcinol and formaldehyde in a sol-gel process, solvent replacement and drying at room temperature. The phloroglucinol-resorcinol-formaldehyde carbon aerogels (CPRF) were prepared by charring the PRF at high temperature under the aegis of helium flow. The microstructure of CPRF was characterized by infrared spectroscopy, specific surface area analyzer and scanning electron microscopy. The results showed that the CPRF had continuous network structure and high specific surface area.

Nitric Acid Activated Carbon Aerogels for Supercapacitors

2013 ◽  
Vol 302 ◽  
pp. 158-164 ◽  
Author(s):  
Ya Jie Li ◽  
Xing Yuan Ni ◽  
Jun Shen ◽  
Dong Liu ◽  
Nian Ping Liu
Keyword(s):  
Activated Carbon ◽  
Nitric Acid ◽  
Electrochemical Impedance ◽  
Carbon Aerogels ◽  
Electrochemical Performances ◽  
Galvanostatic Charge ◽  
Sem Images ◽  
Resorcinol Formaldehyde ◽  
Charge Discharge ◽  
Discharge Test

The electrochemical performances of resorcinol–formaldehyde-based carbon aerogels can be significantly enhanced by nitric acid activation.FT-IR spectra and SEM images reveal the constitution and morphology of samples .The electrochemical performances of materials were tested by cyclic voltammetry,galvanostatic charge/discharge test ,electrochemical impedance spectroscopy and cyclic test. The results show that activation does not influence the molecular structure of carbon aerogels,which maintains their nano-porous structure. Activation increases the specific capacitance by 50% and improves the conductivity of carbon aerogels,resulting in fenfect cycling stability. So nitric acid activated carbon aerogels is an ideal electrode material for supercapacitors.

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